231145000 has 40 divisors (see below), whose sum is σ = 541584450. Its totient is φ = 92456000.

The previous prime is 231144983. The next prime is 231145069. The reversal of 231145000 is 541132.

It can be written as a sum of positive squares in 5 ways, for example, as 51638596 + 179506404 = 7186^2 + 13398^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×231145000² = 106856022050000000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18115 + ... + 28114.

Almost surely, 2^231145000 is an apocalyptic number.

231145000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231145000 is an abundant number, since it is smaller than the sum of its proper divisors (310439450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231145000 is an equidigital number, since it uses as much as digits as its factorization.

231145000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46255 (or 46236 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 231145000 is about 15203.4535550315. The cubic root of 231145000 is about 613.7075994949.

Adding to 231145000 its reverse (541132), we get a palindrome (231686132).

The spelling of 231145000 in words is "two hundred thirty-one million, one hundred forty-five thousand".